So, no surprise, my N62/TU engine in my X5 is finally showing signs of worn out valve guides and valve stem seals, as is common with pretty much every N62 I've seen with 90k+ miles. After a few minutes of idling I will get a little blue-ish-white smoke after giving it some gas. Anyone hear try Liqui-Moly Motor Oil Saver? I've heard it's about the best seal conditioner additive out there. I've heard of people fixing the smoking issue with a seal conditioner additive after a couple months of use. It says it's good for 5 qts, however I have a 9qt sump. Should I use two bottles?